/*
 * jPOS Project [http://jpos.org]
 * Copyright (C) 2000-2015 Alejandro P. Revilla
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jpos.iso.packager;

import org.jpos.iso.ISOBitMapPackager;
import org.jpos.iso.ISOComponent;
import org.jpos.iso.ISOException;
import org.jpos.iso.ISOUtil;

import java.util.BitSet;

/**
 * ISOFieldPackager Binary Bitmap
 *
 * @author <a href="mailto:eoin.flood@orbiscom.com">Eoin Flood</a>
 * @version $Id$
 * @see ISOComponent
 * @see ISOBitMapPackager
 */
public class Base1_BITMAP126 extends ISOBitMapPackager {
	public Base1_BITMAP126() {
		super();
	}

	/**
	 * @param len         - field len
	 * @param description symbolic descrption
	 */
	public Base1_BITMAP126(int len, String description) {
		super(len, description);
	}

	/**
	 * @param c - a component
	 * @return packed component
	 * @throws ISOException
	 */
	public byte[] pack(ISOComponent c) throws ISOException {
		return ISOUtil.bitSet2byte((BitSet) c.getValue());
	}

	/**
	 * @param c      - the Component to unpack
	 * @param b      - binary image
	 * @param offset - starting offset within the binary image
	 * @return consumed bytes
	 * @throws ISOException
	 */
	public int unpack(ISOComponent c, byte[] b, int offset) throws ISOException {
		int len;
		//
		// For a this type of Bitmap bit0 does not mean
		// that there is a secondary bitmap to follow
		// It simply means that field 1 is present
		// The standard IFB_BITMAP class assumes that
		// bit0 always means extended bitmap
		//
		BitSet bmap = ISOUtil.byte2BitSet(b, offset, false); // False => no extended bitmap

		c.setValue(bmap);
		len = (len = bmap.size()) > 128 ? 128 : len;
		return len >> 3;
	}

	public int getMaxPackedLength() {
		return getLength() >> 3;
	}
}
